Name
LESSON
Date
Outline
Waves and Sound
Use your textbook to help you fill in the blanks.
What are waves?
energy
1. Waves are disturbances that transfer
from one point to another.
2. Waves that travel through a medium and cause matter
transverse
to move up and down are called
waves.
3. Waves that cause matter to move back and forth are
called
compression
waves.
crest
4. A wave has a high point called a(n)
trough
and a low point called a(n)
.
How can you measure waves?
5. The distance between wave crests or troughs is
called
wavelength
.
6. The number of wave crests that pass a point in one unit
frequency
of time is a wave’s
.
© McGraw-Hill Education
How does sound travel?
compressional
7. A sound wave is a(n)
produced by vibrations in matter.
8. Sound waves travel at different
different materials.
wave
speeds
in
solids
9. Sound waves move fastest through
slower through liquids, and slowest through
gases
Unit 5 • Properties of Energy
Unit Resources
,
.
Use with Lesson 2
Waves and Sound
5-19
LESSON
Outline
Name
Date
What are properties of sounds?
pitch
10. The highness or lowness, or the
,
of a sound depends on the frequency of the sound waves.
11. The pitch of a sound changes when the source or the
listener is in motion because of the
Doppler effect
.
12. The motion of two or more waves passing through
the same medium at the same time is called
interference
.
How do we hear music?
13. Guitars and violins are examples of
instruments.
stringed
14. We hear sounds because sound waves strike our
eardrums
and cause them to vibrate.
music
15. A pleasant combination of sounds is called
and an unpleasant combination of sounds is called
noise
,
.
Critical Thinking
16. How does sound travel from a piano to make music?
Possible answer: A piano makes its sound by striking metal strings
with hammers to make them vibrate. When a key is pressed, it
bounce off, causing the strings to vibrate. These vibrations cause
sound waves, which travel to our ears and make our eardrums vibrate.
5-20
Unit 5 • Properties of Energy
Unit Resources
Use with Lesson 2
Waves and Sound
© McGraw-Hill Education
triggers a hammer to hit a certain string (or certain strings) and